Nature Communications
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2025
·Vol. 16
·期 1
·1-12
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IF 15.7
Li Xin,Li Wenlang,Deng Ziqi,Wang Jingtian,He Shan,Ou Xinwen,Phillips David Lee,Xiao Guanjun,Zou Bo,Kwok Ryan T. K.,Sun Jianwei,Lam Jacky W. Y.,Guo Zhihong,Tang Ben Zhong
Achieving long-lived room temperature phosphorescence (RTP) in organic materials has garnered significant attention in the field of optoelectronics. Although many host−guest systems with versatile performances have been developed, their photophysical mechanisms remain unclear due to the complicated intermolecular interactions and multiple energy transfer pathways, leading to unavoidable trial-and-error in molecular designs. Here we reveal that the dynamic coupling process in the excited state is crucial for inducing phosphorescence, where host and guest molecules firstly couple to enhance the intersystem crossing efficiency, and then decouple to transfer excitons to the triplet state of guest. Such a process shows universal applicability and tunable performance, with the longest lifetime for red RTP ( τ P = 2.4 s) reported so far. We anticipate the present work as a starting point for more sophisticated models on excited-state dynamic behaviors within host−guest systems.
研究领域:
光学材料
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光电子学
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物理化学
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产品关联
DOI
PubMed
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2021
·
IF 13.273
Mengzhu Wang,Feiyang Li,Yunxiang Lei,Fuming Xiao,Miaochang Liu,Shujuan Liu,Xiaobo Huang,Huayue Wu,Qiang Zhao
The development of organic phosphors with excitation-dependent luminescence color is tremendously challenging for organic room temperature phosphorescent (ORTP) systems. Herein, we designed and synthesized a series of novel ORTP materials based on pyranone. Under the excitation of 254 nm, the materials exhibited the rare phenomenon of emitting almost pure phosphorescence, whereas strong cyan photoluminescence and weak green phosphorescence were observed upon exposure to 360 nm excitation light. Experiment analysis and theoretical calculations demonstrate that the regulation of luminescent color is attributed to the different transition process of excitons from singlet excited states (S 1 and S 2 ) to triplet excited states (T 1 ) under various excitation wavelengths. The materials still can maintain the crystalline state under various extreme conditions (ground, recrystallization, high pressure), thereby maintaining the ORTP properties. In addition, the ORTP properties of the materials are very stable to water/heat/light/air. Taking advantage of the multiple luminescence colors, excellent crystallinity and stability, these phosphors can be developed as an advanced anti-counterfeiting ink for printing and hand-painting on a wide range of media, showing an extremely ideal application prospect.
研究领域:
材料科学
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光学
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化学
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DOI
高影响因子
Nature Communications
·
2021
·Vol. 12
·期 1
·1-8
·
IF 14.919
Xie Zongliang,Zhang Xiayu,Wang Hailan,Huang Cheng,Sun Haodong,Dong Mengyang,Ji Lei,An Zhongfu,Yu Tao,Huang Wei
The rational lifetime-tuning strategy of ultralong organic phosphorescence is extraordinarily important but seldom reported. Herein, a series of multi-host/guest ultralong organic phosphorescence materials with dynamic lifetime-tuning properties were reported. By doping a non-room-temperature phosphorescence emitter into various solid host matrices with continuously reduced triplet energy levels, a wide-range lifetime (from 3.9 ms gradually to 376.9 ms) phosphorescence with unchangeable afterglow colors were realized. Further studies revealed that the host matrices were employed to afford rigid environment and proper energy levels to generate and stabilize the long-live triplet excitons. Meanwhile, these multi-host/guest ultralong organic phosphorescence materials also exhibited excitation-dependent phosphorescence and temperature-controlled afterglow on/off switching properties, according to the virtue of various photophysical and thermal properties of the host matrices. This work provides a guiding strategy to realize lifetime-tuning ultralong organic phosphorescence with lifetime-order encoding characteristic towards widespread applications in time-resolved information displaying, higher-level security protection, and dynamic multi-dimensional anti-counterfeiting.
研究领域:
材料科学
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光学
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化学
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产品关联
DOI
PubMed
高影响因子
NATURE MATERIALS
·
2020
·Vol. 20
·期 2
·175-180
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IF 38.663
Chen Chengjian,Chi Zhenguo,Chong Kok Chan,Batsanov Andrei S.,Yang Zhan,Mao Zhu,Yang Zhiyong,Liu Bin
Commercial carbazole has been widely used to synthesize organic functional materials that have led to recent breakthroughs in ultralong organic phosphorescence 1 , thermally activated delayed fluorescence 2 , 3 , organic luminescent radicals 4 and organic semiconductor lasers 5 . However, the impact of low-concentration isomeric impurities present within commercial batches on the properties of the synthesized molecules requires further analysis. Here, we have synthesized highly pure carbazole and observed that its fluorescence is blueshifted by 54 nm with respect to commercial samples and its room-temperature ultralong phosphorescence almost disappears 6 . We discover that such differences are due to the presence of a carbazole isomeric impurity in commercial carbazole sources, with concentrations <0.5 mol%. Ten representative carbazole derivatives synthesized from the highly pure carbazole failed to show the ultralong phosphorescence reported in the literature 1 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 . However, the phosphorescence was recovered by adding 0.1 mol% isomers, which act as charge traps. Investigating the role of the isomers may therefore provide alternative insights into the mechanisms behind ultralong organic phosphorescence 1 , 6 , 7 , 8 , 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 .
研究领域:
有机材料科学
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光化学
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材料化学
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产品关联
DOI
PubMed
高影响因子
ADVANCED FUNCTIONAL MATERIALS
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2023
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IF 19
Guangqiang Yin,Guifei Huo,Min Qi,Depeng Liu,Longqiang Li,Jiayin Zhou,Xiaoxia Le,Yu Wang,Tao Chen
Information leakage and counterfeiting are serious worldwide issues that tremendously impact legitimate businesses and human life. Inspired by the Noctiluca scintillans, a new fluorescence-afterglow dual-modal information encryption enabled by precisely coordination-modulated ultralong organic phosphorescence (UOP) is presented. Strikingly, the optical properties including fluorescence, lifetime and intensity of UOP can be precisely modulated on-demand through energy transfer by lanthanide (Ln III ) coordination, which enables information camouflage by similar Ln III luminescence to provide misleading information along with data decryption in the form of mutual afterglow. Moreover, the important data can be encrypted in a spatial-time-resolved way by programmatically coding information with afterglow gradients, yielding greatly improved security for verifying the authenticity. This study provides a new avenue to precisely modulate the optical properties of UOP materials and broadens the scope of optical materials for innovative information encryption and anticounterfeiting applications.
研究领域:
材料科学
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光学
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信息安全
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产品关联
DOI
高影响因子
ANALYTICAL CHEMISTRY
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2024
·
IF 6.7
Jiuchuan Guo,Yudong Zhou,Jie Cheng,Fuli Chen,Jiahui Xu,Lirong Yang,Huifang Shi,Zhongfu An,Jinhong Guo,Xing Ma
Lateral flow immunoassay (LFIA), a classical point-of-care testing (POCT) technique, plays an important role in disease screening and healthcare monitoring. However, traditional LFIA is either designed for qualitative analysis or requires expensive equipment for quantification, limiting its use in household diagnosis. In this study, we proposed a new generation of LFIA for household health monitoring by using ultralong organic phosphorescence (UOP) nanomaterials as afterglow nanoprobes with a self-developed palm-size sensing device. The UOP nanoprobes exhibit a phosphorescence signal with a second-level lifetime, which completely avoids the interference from excitation light and biological background fluorescence. Therefore, an ultraminiaturized and low-cost UOP nanosensor was successfully designed by eliminating the complex optical path and filtering systems. We chose an inflammatory factor, C-reactive protein (CRP), for household POCT validation. The whole analysis was completed within 9 min. A limit of detection (LOD) of 0.54 ng/mL of CRP antigen was achieved with high stability and good specificity, which is comparable to laboratory instruments and fully satisfying the clinical diagnosis requirement.
研究领域:
生物医学工程
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分析化学
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医学诊断
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纳米技术
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即时检测设备
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产品关联
DOI
PubMed
高影响因子
CHEMISTRY OF MATERIALS
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2024
·
IF 7.2
Lingling Kang,Cong Chao,Chenchen Xiong,Shuang Yu,Changtao Xiao,Changsheng Zhao,Shisheng Cui,Jiguang Li,Jing Li,Jianbing Shi,Bin Tong,Zhuo Wang,Yin Song,Weiqian Zhao,Zhengxu Cai,Yuping Dong
Exciton dynamics exert a pivotal role in the photodynamic efficiency of photosensitizers, however, strategies for modulating exciton dynamics to motivate electron transfer in exciton-involved photoreactions remain largely unexplored. Herein, we employed a cutting-edge microfluidic platform combined with computational fluid dynamics to encapsulate a commercial type II PS [rose Bengal (RB)] within a rigid host matrix. This encapsulation yielded host/RB nanoparticles (NPs) with a uniform structure and controllable size. The photoexcited dynamics of these host/RB NPs were characterized using time-resolved spectroscopy, and the results revealed that encapsulation not only extended the triplet exciton lifetime of RB, but also created an optimized environment to motivate electron transfer between RB molecules. These findings rationalize the observed remarkable 20-fold reduction in type II photoreaction and a 3-fold promotion in type I photoreaction for host/RB NPs. Due to the dramatic generation of HO• and O2•–, host/RB NPs demonstrated excellent ability for the in vitro eradication of Staphylococcus aureus and Escherichia coli biofilms and the in vivo treatment of S. aureus-infected wounds under hypoxia, with a minimum killing concentration of 10–7 M. This work sheds light on the motivation of exciton transfer to develop type I PS with enhanced photodynamic properties.
研究领域:
材料科学
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光动力学
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纳米技术
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生物医学工程
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微生物学
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产品关联
DOI
高影响因子
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